linux-kernel - Re: [PATCH] video: constify geode ops structures

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Message-ID: <CAGXu5jJp4hQKWyQhu5fqgnvAEgeWDAKtaDm2norVM19n=+qigQ@mail.gmail.com>
Date:	Mon, 9 Nov 2015 13:20:12 -0800
From:	Kees Cook <keescook@...omium.org>
To:	Dan Carpenter <dan.carpenter@...cle.com>
Cc:	Julia Lawall <Julia.Lawall@...6.fr>,
	Jean-Christophe Plagniol-Villard <plagnioj@...osoft.com>,
	kernel-janitors@...r.kernel.org,
	Tomi Valkeinen <tomi.valkeinen@...com>,
	linux-geode@...ts.infradead.org, linux-fbdev@...r.kernel.org,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] video: constify geode ops structures

On Sun, Nov 8, 2015 at 2:16 PM, Dan Carpenter <dan.carpenter@...cle.com> wrote:
> Cool.  So, in grsec they use a GCC plugin to make these const
> automatically since they only contain function pointers.  There about
> 100 struct types marked as __no_const.  Kees would like to adopt the
> grsec pluggin approach I expect.  Do you have an idea how many structs
> only contain function pointers or how many consts we would have to add
> to get the same effect without the plugin?

Just to remind everyone: while we certainly want to clean these up in
the code where possible, we still want to make the constification
plugin part of the regular builds. We want to provide a
secure-by-default build, even when vendors are adding their own
out-of-tree code when producing Linux-based products. So, we'll always
want to have the plugin as a back-stop for out-of-tree code, or places
where const was accidentally missed upstream.

-Kees

>
> regards,
> dan carpenter
>
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-- 
Kees Cook
Chrome OS Security
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